Prokaryotic Cells

2-20 micrometer

unbound nucleoid

smaller size

circular DNA

complex cell wall

reproduction by binary fission

no membrane bound organelles

small ribosome 70s

archea

three main group:
- methanogens
-extreme halophiles
-extreme thermophiles

cell wall lack peptidoglycan

membrane fats are ether

found in extreme environment

bacteria

unicellular organisms

genetic material not enclosed in a nuclear membrane

various shape (round, flattened, thick, thin, short or long)

various form (singly, in pairs, chains or clusters)

bacteria shape

coccus

diplococci

tetrads

sarcinae

streptococci

plasma membrane

can have multiple plasma membrane

responsible for controlling what gets into and out of the cell

cytoplasm

gel-like, fluid substance

does not contain organelles

ribosome

smaller and have a slightly different shape and composition

build proteins by translating messages sent from DNA

genetic material

contain small pieces of DNA called plasmids

contain large quantities of genetic material in the form of DNA and RNA